tree 16b6c5529b11af841a6ebbdbe4b8e9d362946526
parent f875aaa339e864410b7243d312d06020f86845f8
author Jerry Zhang <zhangjerry@google.com> 1528224292 -0700
committer Jerry Zhang <zhangjerry@google.com> 1528407198 -0700

libsparse: Add method to create sparse file from buffer

Refactor elements of sparse file parsing that depend on
an fd into SparseFileSource class, then create implementations
using both fd and buffer. Add sparse_file_read_buf which
reads the given buffer into a sparse file cookie without
copying.

Test: flash system with sparse images
Bug: 78793464
Change-Id: Ice6c8e1ff075d6867e070f80fcf5aa4f530a1b95